/Engine/Source/Runtime/Slate/Public/Framework/MultiBox/MultiBoxBuilder.h
Pushes a new command list onto the stack. This command list will be used for all subsequently-added multiblocks, until the command-list is popped.
void PushCommandList ( const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< const [FUICommandList](API\Runtime\Slate\Framework\Commands\FUICommandList) > CommandList )